I have a plugin on the marketplace that uses most of the nodes you’d need (with a different purpose):
Still, you can probably dig into how to do it by searching nodes / docs or c++ like i did to create the plugin.
It’s definitely not the best documented thing, the whole engine is actually quite the opposite, but its not impossible obviously.
From what i remeber, at a base level theres 2 collections.
One of meshes used, one of actual instances.
They two are linked togeter.